SLLens.h

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/**
 * \file      SLLens.h
 * \date      October 2014
 * \authors   Marcus Hudritsch
 * \copyright http://opensource.org/licenses/GPL-3.0
*/
 
#ifndef SLLENS_H
#define SLLENS_H
 
#include <SLRevolver.h>
 
//-----------------------------------------------------------------------------
//! SLLens creates a lens mesh based on SLRevolver
/*!
SLLens creates a lens mesh based on SLRevolver.
Different constructors allow to either create the lens from the values
written in the eyeglass prescription card or from the radius of the lens.<br>
<br>
<b>Lens types:</b>
@image html images/LensTypes.png
<b>Myopia</b> ( http://en.wikipedia.org/wiki/Myopia )<br>
The eye is too long for its optical power.<br>
To correct myopic (short-sightedness) a diverging lens is needed.
@image html images/Myopia.png
<b>Hypermetropia</b> ( http://en.wikipedia.org/wiki/Hyperopia )<br>
The eye is too short for its optical power.<br>
To correct presbyopic (far-sightedness) a converging lens is needed.
@image html images/Hypermetropia.png
*/
class SLLens : public SLRevolver
{
public:
    //! Create a lens with given sphere, cylinder, diameter and thickness
    SLLens(SLAssetManager* assetMgr,
           double          sphere,
           double          cylinder,
           SLfloat         diameter,
           SLfloat         thickness,
           SLuint          stacks = 32,
           SLuint          slices = 32,
           SLstring        name   = "lens mesh",
           SLMaterial*     mat    = nullptr);
 
    //! Create a lens with given radius, diameter and thickness
    SLLens(SLAssetManager* assetMgr,
           SLfloat         radiusBot,
           SLfloat         radiusTop,
           SLfloat         diameter,
           SLfloat         thickness,
           SLuint          stacks = 32,
           SLuint          slices = 32,
           SLstring        name   = "lens mesh",
           SLMaterial*     mat    = nullptr);
 
private:
    void    initLens(SLfloat     diopterBot,
                     SLfloat     diopterTop,
                     SLfloat     diameter,
                     SLfloat     thickness,
                     SLuint      stacks,
                     SLuint      slices,
                     SLMaterial* mat);
    void    generateLens(SLfloat     radiusBot,
                         SLfloat     radiusTop,
                         SLMaterial* mat);
    SLfloat generateLensBot(SLfloat radius);
    SLfloat generateLensTop(SLfloat radius);
    SLfloat calcSagitta(SLfloat radius);
 
    SLfloat _diameter;    //!< The diameter of the lens
    SLfloat _thickness;   //!< The space between the primary planes of lens sides
    SLfloat _radiusBot;   //!< The radius of the bot (front) side of the lens
    SLfloat _radiusTop;   //!< The radius of the top (back) side of the lens
    SLbool  _pointOutput; //!< debug helper
};
//-----------------------------------------------------------------------------
#endif // SLLENS_H